You didn't mention if you have a 248 or a 320. Olds & Pontiac were open drive as opposed to Buick's torque tube, but ALL the internals are basically the same for 6 bolt top cover trans. As I recall ALL the Pontiac's & Olds used Buick's heavy duty 6 bolt top cover trans. If yours is a 6 bolt also it will just be a bolt-in swap. Only thing to look out for would be input shaft length. If you have a 5 bolt top cover from a 248 it's still possible with some small mods.
Tom Telesco
Classic and Muscle Automotive
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